Rotary hone



Aug 3931 w. R. CHERMACK 1,819,408

ROTARY HONE Filed Nov. 23, 1929 3 Sheets-Sheet 1 Aug; 1931- w. R.CHERMACK 1,819,408

'ROTARY HONE Fild Nov. 23. 1929 3 Sheets-Sheet 2 1 H van for Mnclw fi6%???72126'5 Bygg n Y A iomey Aug. 18 1931. w. R. CHERMACK ROTARY HONEFiled NOV. 23, 1929 3 Sheets-Sheet 3 I Mnclow E .U/zermav? A iiorhey 25by providing one which is 735 tion and drawings.

I operable expanding Patented Aug. 18, 1931 GFFICE WINGLOW R. CHER-MACK,OF HOPKINS, MINNESOTA ROTARY HON'E Application filed November 23, 1929.Serial No. 409,351.

This invention relates'to improved tools which may be convenientlyentitled a rotary hone, and it has more particular reference to astructure of this type which is employed 5 for the purpose ofreconditioning the interior of cylindrical bodies, such as automobileengine cylinders, pump cylinders, and in fact cylinders of all types.

Briefly described, the invention has refer- 1 ence to a tool of thisclass which embodies, among other parts, a rotary propelling shaftprovided with a plurality of circumferentialfly spaced eccentricallypivoted honing stones, and means of a yieldable nature for 15maintaining said stones in yieldable contact with the surface beingtreated, said means serving as an automatic adjusting and tensioningdevice for the stones.

I amaware of the fact that it is not broadly if 29 new to provide areconditioning toolof this type in the nature of a. structure including.a honing stone. My principal aim is therefore, to: generally improveupon known patented and marketed tools of thesimilar class,characterized by a novel arrangement of parts, mechanically associatedand cooperating in securingthe production of a more'practicable toolwhich will fulfill the requirements of a device. of

this-class in a highly satisfactory and efficient manner.

The specific elements, and their mechanical relationship or coordinationwill become-more readily apparent from the followingldescrip- In. thedrawings: Figure 1 isa top plan view of a; hone constructecl inaccordance with the present invention, showing the manner in which it isused.

Fig. 2 is a longitudinal sectional view taken approximately on the planeof the line 2-2 of Fig. 1. i

Fig. 3 is a detail view of the central portion ofthe structure includingthe automatically elements- 7-. Fig. 4: is a horizontaldetail sectiontaken approximately on of Fig. 2.

Fig. 5 is a cross section on the line 55 3 50 of Fig. 3.

the peripheral the plane of the line H Fig. 6 is a cross sectionion theline 6-6 of Fig. 3.

Fig. 7 s. a

bottom plan view of the structure seen in Fig. 3.

. Fig. 81s a fragmentary p one of the stones.

propelling shafts 11 respectively.

These plates are of the top plan configuratmn shown in Fig. 1. Theswingably mounted hones generally designated by the reference characters12, are

mounted between these plates and in radially spacedzrelation. from theconcentric shafts 9. I have found it expedient toprovide a roup ofhones, and each one is tion and comprises nel-shaped holder wedge-shapedhonlng stone 14 and suitable retention clamps 15.1 At opposite, endsfive of these swingably mounted thesame in construca carrier includinga'chan- 13 (see Fig. 4:) for the e'ccentrica-lly mounted on the headplates .andll-respectively,

swing edge portions of said plate. these hones aresubstantially pletehone to Incidentally,

thus allowing the combodily with respect to self-adj usting and aremaintained in constant yieldable contact withqthe internal surface ofthecylinder 18 as seen in Fig. 1.

Moreover, the edge portions of the plates 10 and 11 are notched out toclearance for the swinging action of the hones.

The car- I riers include inwardly projected flanges formed "withconverging inclined". edges 19 and 20 as seen in' cams.

Fig. .2 which function as Thesevcammed edges are cooperable with conicalexpanding elements 21 and :22 'slidablymounted on the shafts and engag-:

ing the edges 19 and 20 as seen in Fig. 2.

coiled, spring .23 and bears at its standards. I also In thisconnection, Ijcall which surrounds the opposite ends against theattention to a shaft desire to mention the diaerspective View of iprovide outstanding lugs 16 provided with pintles 17 which are changingtheir active relationship,

metrically opposite guide slots 24 formed in the shaft.

At this time, I invite attention to Fig. 3, wherein it will be observedthat the reference character 25 designates an adjusting screw which iscooperable' at its opposite ends, with spider-like followers generallydesignated by the reference characters 26 and 27 respectively. The upperfollower includes a central washer 28 cooperable with the headed ends 29of the screw, and provided with diametrically outstanding arms 30 whichproject through and beyondthe slots and engage the narrow end portion ofthe adjacent expander 21.

The lower end of the shaft is screw threaded as at 31 and cooperateswith the screw threads formed in the central opening of the lowermostwasher 32. This washer is also provided with outstanding guide arms 33to function as keys and engage the lower expander 22. It will be notedthat these expanders are disposed in reversed order. Thus, the expansionof the spring serves to hold the expanders in engagement with therespective followers 26 and '27 as seen in Fig. 3.

However, by adjusting the rods, the followers are drawn toward eachother to move the expanders 21 and 22 toward each other against thetension of the spring, thus to bring about greater or less pressure onthe cam edges 19 and 20 for the respective bones.

The gist of the invention is in the provi- 'sion of the tubular drive ofpropeller shaft carrying a longitudinally spaced head, constituting a.honing for the eccentrically pivoted swingable carriers of the quintetof hones.

The natural expansion of the expanders 21 and 22 maintains a constantpressure on the flange portions of these hones, and thereby maintainsthe honing blocks or stones in proper contact with the interior surfaceof the cylinder, as seen in Fig. 1. In this way, the hones areautomatically adjustable and yieldably maintained in place.

From the foregoing description and drawings, it will be seen that I haveevolved novel structural arrangements of parts, which when associated asshown and described, will fulfill the requirements of a tool of thisclass in a highly satisfactory and practicable manner.

' It is thought that persons skilled in the art to which the inventionrelates will be able to obtain a clear understanding of the same, afterconsidering the drawings and description. Therefore, a more lengthydescription'is regarded as unnecessary.

'Minor changes in shape, size, and rearrangement of elements, comingwithin the field of invention claimed, nay be resorted to in actualprac' ce if desired.

engageable by the expanders Having thus described my invention, what Iclaim as new is 1. In a cylinder hone of the class clescribed, a shaft,a pair of longitudinally spaced mounting plates of disk-like formmounted on said shaft, a plurality of circumferentially spaced honingdevices, each device comprising a holder, a stone fastened in saidholder, an inwardly projecting flange having converging cam edges, apair of outstanding lugs, pintles carried by said lugs and eccentricallypivoted in bearing openings in said plates, automatically operableexpanding means cooperable with said cam edges and mounted on saidshaft, and embodying a pair of shiftable longitudinally spacedspring-pressed conical expanders and adjustable stops foriimiting themovement of the said expanders away'from each other.

2. In a cylinder hone of the glass described, a shaft, a pair oflongitudinally spaced mounting plates of-disk-like form mounted on saidshaft, a plurality of circumferentially spaced honing devices, eachdevice comprising a holder, a stone fastened in said holder, an inwardlyprojecting flange having converging cam edges, a pair of outstandinglugs, pintles carried by said lugs and eccentrically pivoted in bearingopenings in said plates, automatically operable expanding meansco-operable with said cam edges and mounted on said shaft, and embodyinga pair of longitudinally spaced conical expanders, a spring yieldablyurging the expanders away from each other, adjustable stops for limitingthe movement of the said expanders away from each other, and anadjusting screw connected with said stops for adjusting the stops towardeach other to bring said expanders toward each other against the tensionof the spring.

3. In a structure of the class described, a rotary propeller shaftprovided with diametrically opposite slots, a screw threaded boltarranged centrally in said shaft, a pair of longitudinally spacedfollowers functioning as stops and including central washers andoutstanding arms, said arms projecting through and beyond the slots,'a'pair of conical expanders surrounding and slidable on said shaft, aspring surrounding the shaft and hearing at its ends against the innerends of said expanders in a manner to force said expanders intoengagement with the arms of said followers, and a plurality ofadjustable honing devices arranged circumferentially around the shaftand operatively for adjustment thereby.

In testimony whereof I affix my signature.

WINCLOVV R. CHERMACK.

